【摘 要】
：
Trying to achieve the best surface accuracy control with the fewest actuators,this article mainly studies the distribution of actuators and the method of panel design.The influence of the number of faulty actuators on the accuracy of the surface shape is
【机 构】
：
Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Key Laboratory o
论文部分内容阅读
Trying to achieve the best surface accuracy control with the fewest actuators,this article mainly studies the distribution of actuators and the method of panel design.The influence of the number of faulty actuators on the accuracy of the surface shape is demonstrated.In addition,the method incorporating a triangular panel,node index and the fitting solution method of a single panel is also given.This method provides a reference for the design and realization of an active surface or a deformable sub-reflector for high performance large aperture radio telescopes.
其他文献
文献系统分析发现,围绕教与学形成侧重作为知识的分数和关注分数认知事实两条不同研究主线,且偶有交叉,反映了传统教育“教学围绕教师发生”特点的影响.以分数教学研究为透镜,探讨以学生分数认知为基础进行教材编排,由测量模型引入分数概念的可行性,体现教育研究对学生学习的真切关怀.提出基于“学”展开数学知识探讨以丰富知识内涵;关注学生学习发生真实过程以改进教学实践;深化数学学习评价以促进学生核心素养培养;强化教师数学教学观以指导教学实践研究,为数学教育提供借鉴.
This paper presents a database of the spectroscopic-and photometric-spectral energy distributions(spec-SEDs and phot-SEDs respectively) of the progenitors of core-collapse supernovae (CCSNe).Both binary-and single-star progenitors are included in the data
由于观点的双重叠合造成数感认识的模糊;从数感的提出到修订体现了中国教育价值取向从知识立意到能力立意,再到素养立意的转变历程;通过梳理学者的论述,可从3个维度认识数感的内涵:直觉能力为基础、活动感悟为过程、态度意识为目标;数感的培养可从“数与数量及数量关系”和“运算结果的估计”两方面进行.
以探寻实践中如何进行教师教育为出发点,从内容维度、形式与过程维度、结果维度对国外新世纪以来数学史与数学教师教育的关系进行了考察.研究发现:国外以数学史为载体的教师教育强调原始素材的运用,注重多元文化与民族数学;教师教育的形式多元,强调培训对象的深度参与,教师教育过程与结构精致,注重整体优化;教师教育在知识、信念等方面取得了一定的成效.启示:要对教师教育的内容与形式进行合理规划;强调学科内容知识与教学内容知识的平衡;注重教学、科研、项目间的联动.
高考评价体系倡导“价值引领、素养导向、能力为重、知识为基”的综合评价,因此以高考评价体系的理念为导向,构建符合五育并举、立德树人高考目标的试题测评框架.以2020年3份新高考数学试题——北京卷、天津卷和山东卷为例进行测评,并利用多元统计分析方法研究2020年数学新高考的命题特点,分析得出:3套试题的命题思路基本体现高考评价体系的宗旨,但在部分维度上,不同地区试题之间存在显著性差异,对于如数学建模、应用性和创造性等方面,3套试题的考查力度不足.依据结论对教学工作和未来高考命题提出如下建议:创设多样情境,体现
This paper is contributed to the structural stability of multi-wave configurations to Cauchy problem for the compressible non-isentropic Euler system with adiabatic expo-nent γ ∈ (1,3].Given some small BV perturbations of the initial state,the author empl
应用斯蒂利亚尼德斯的推理与证明分析框架,分析人教版、北师版、北京版3个版本七年级教材中的推理与证明.研究发现:七年级教材中的推理与证明任务较少,其中,数与代数内容领域中包含的任务最多,其次是图形与几何、统计与概率内容领域;进而分析推理与证明的子活动的设计意图,发现大多数确定的模式没有促进形成猜想,大多数猜想没有促进证明.研究结果对中国教材研究具有一定的启示,不同版本教材中各内容领域均存在推理与证明;数学教材编排的特点是螺旋上升;教师应注重教学过程中给予学生推理与证明的机会.
We present a pulsar candidate identification and confirmation procedure based on a position-switch mode during the pulsar search observations.This method enables the simultaneous search and confirmation of a pulsar in a single observation,by utilizing the
We present here the results of broadband spectral analysis of a low-mass X-ray binary and a black hole candidate 4U 1957+11.The source was observed nine times with the Nuclear Spectroscopic Telescope Array (NuSTAR) between September 2018 and November 2019
Discovery of pulsars is one of the main goals for large radio telescopes.The Five-hundred-meter Aperture Spherical radio Telescope (FAST),that incorporates an L-band 19-beam receiver with a system temperature of about 20 K,is the most sensitive radio tele